BigBeans
10+ Year Contributor
- 1,423
- 29
- Aug 16, 2009
-
I am in,
Rhode Island
I've finally got my car reassembled and tuned halfway decent, so i thought i'd write a quick post about the Delta K272s i'm using, because i've seen several people ask about Delta cams. These are new billet cores ground with a profile similar to Kelford 272s.
First, as i found out the hard way, you need a lot of valvespring with these cams. I'm running the Ferrea Beehives and it's working well.
I have my cams degreed at -3 intake, +3 exhaust. The reduced overlap has given me a completely smooth idle, and helped eliminate some of the boggy feeling on the street. The car doesn't sound cammed at all. There's no "lope" really, just an occasional misfire at idle. This means the idle is relatively smooth in the car, which i like. It also means anyone listening to the car will not know it's cammed, and i like flying below the radar. With the cams set at 0 degrees the lope is very heavy, and driveability is simply awful on the street.
Driveability: It's OK. With the reduced overlap they are tolerable on the street, but the motor is still very dead in the low RPMs. Below 2000, the motor chugs a bit if there is any real load/throttle. From 2000-2500 it smooths out, but will not make any power at all. At 3000rpm, it finally starts to come to life a bit. Highway passing isn't an issue, but it's certainly not going to surprise you with off boost torque. I can live with it, but off boost it is very weak. It feels entirely different than my last cam setup, which was HKS 264/272, a fantastic combo for driveability. Of course, i expected this so it's no issue.
Flow: I'm using an FP3052, tuned at 25psi on pump gas. I had meth issues when we were dyno tuning, so i haven't started playing with that yet. I'm also using a JMF race manifold, well ported head, FP exhaust mani, FP 2.5" O2 housing into a 3" catless exhaust. The setup is flowing50lbs/min by 7,000rpm, and 52lbs/min at 7800rpm, both at 25psi. For a turbo rated at 52lbs, these are awesome numbers, and exactly what i was aiming for with the setup. The turbo is close to maxed out. I'll go up on the boost to increase midrange torque, but it'll taper off and i'll see similar flow up top. These cams definitely breathe
The torque curve is essentially a straight line from full boost at 4500, all the way to 7000, where it begins to taper slightly. This means the motor is a top end screamer, as a flat tq curve means the horsepower curve climbs quickly with rpm. Peak TQ comes at 6000, and peak horsepower was at 7300.
I haven't started playing with the tune yet, but i have a feeling that the tuner pulled a ton of ignition timing based on phantom knock, so power isn't where it should be. If that's not the case, than i have some issue causing the car to knock with very low timing (8*). I'll know soon enough.
First, as i found out the hard way, you need a lot of valvespring with these cams. I'm running the Ferrea Beehives and it's working well.
I have my cams degreed at -3 intake, +3 exhaust. The reduced overlap has given me a completely smooth idle, and helped eliminate some of the boggy feeling on the street. The car doesn't sound cammed at all. There's no "lope" really, just an occasional misfire at idle. This means the idle is relatively smooth in the car, which i like. It also means anyone listening to the car will not know it's cammed, and i like flying below the radar. With the cams set at 0 degrees the lope is very heavy, and driveability is simply awful on the street.
Driveability: It's OK. With the reduced overlap they are tolerable on the street, but the motor is still very dead in the low RPMs. Below 2000, the motor chugs a bit if there is any real load/throttle. From 2000-2500 it smooths out, but will not make any power at all. At 3000rpm, it finally starts to come to life a bit. Highway passing isn't an issue, but it's certainly not going to surprise you with off boost torque. I can live with it, but off boost it is very weak. It feels entirely different than my last cam setup, which was HKS 264/272, a fantastic combo for driveability. Of course, i expected this so it's no issue.
Flow: I'm using an FP3052, tuned at 25psi on pump gas. I had meth issues when we were dyno tuning, so i haven't started playing with that yet. I'm also using a JMF race manifold, well ported head, FP exhaust mani, FP 2.5" O2 housing into a 3" catless exhaust. The setup is flowing50lbs/min by 7,000rpm, and 52lbs/min at 7800rpm, both at 25psi. For a turbo rated at 52lbs, these are awesome numbers, and exactly what i was aiming for with the setup. The turbo is close to maxed out. I'll go up on the boost to increase midrange torque, but it'll taper off and i'll see similar flow up top. These cams definitely breathe
The torque curve is essentially a straight line from full boost at 4500, all the way to 7000, where it begins to taper slightly. This means the motor is a top end screamer, as a flat tq curve means the horsepower curve climbs quickly with rpm. Peak TQ comes at 6000, and peak horsepower was at 7300.
I haven't started playing with the tune yet, but i have a feeling that the tuner pulled a ton of ignition timing based on phantom knock, so power isn't where it should be. If that's not the case, than i have some issue causing the car to knock with very low timing (8*). I'll know soon enough.
